package com.sky.service.impl;

import cn.hutool.crypto.digest.BCrypt;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对,需要进行bcrypt加密比对
        String pwdEncrypt = employee.getPassword();
        boolean result = BCrypt.checkpw(password,pwdEncrypt);

        if (!result) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }


        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }


    /**
     * 新增员工
     *
     * @param dto
     */
    public Result addEmp(EmployeeDTO dto) {
        //1.参数校验，非空判断,提升代码的健壮性
        if(dto.getUsername()==null){
            return Result.error(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //2.根据账号去查询数据库是否存在，如果存在，则直接返回错误信息
        Employee employee = employeeMapper.getByUsername(dto.getUsername());
        if(employee!=null){
            return Result.error(MessageConstant.ACCOUNT_EXEIT_FOUND);
        }

        //3.新增操作了 调用mapper接口
        employee=new Employee();
        /**
         * beanutils工具类，进行bean对象属性的拷贝使用
         * 要求，两个对象中的属性名称和属性类型必须完全一致的情况才可以拷贝成功，否则失败
         */
        BeanUtils.copyProperties(dto,employee);
        
        //设置密码，默认密码123456，使用BCrypt加密
        employee.setPassword(BCrypt.hashpw(PasswordConstant.DEFAULT_PASSWORD, BCrypt.gensalt()));
        
        //设置状态，默认启用
        employee.setStatus(StatusConstant.ENABLE);
        
        //设置创建时间和更新时间
        employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());
        
        //设置创建人和修改人，从ThreadLocal中获取当前登录用户的id
        employee.setCreateUser(BaseContext.getCurrentId());
        employee.setUpdateUser(BaseContext.getCurrentId());
        
        //调用mapper的方法插入数据
        employeeMapper.addEmp(employee);
        
        return Result.success();
    }

    /**
     * 分页查询员工列表
     *
     * @param dto
     * @return
     */
    @Override
    public Result page(EmployeePageQueryDTO dto) {
        //1.非空判断
        if(dto.getPage()==null){
            dto.setPage(1);
        }
        if(dto.getPageSize()==null){
            dto.setPageSize(5);
        }
        //2.开启分页
        PageHelper.startPage(dto.getPage(),dto.getPageSize());

        //3.根据条件查询员工列表调用mapper
        Page<Employee> pageParam = employeeMapper.pageQuery(dto);

        //4.封装数据，并返回
        PageResult pageResult=new PageResult();
        pageResult.setTotal(pageParam.getTotal());
        pageResult.setRecords(pageParam.getResult());

        return Result.success(pageResult);
    }


    /**
     * 启用禁用
     *
     * @param status 状态 0表示禁用1 表示启用
     * @param id     员工id
     * @return
     */
    @Override
    @Transactional
    public Result updateEmpStatus(Integer status, Long id) {
        //1.非空判断
        if(id==null){
            return Result.error(MessageConstant.ID_NOT_FOUND);
        }
        if(status==null){
            return Result.error(MessageConstant.UNKNOWN_ERROR);
        }
        //2.调用mapper接口，修改状态值
        Employee employee=new Employee();
        employee.setStatus(status);
        employee.setId(id);
        employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.updateEmp(employee);
        //3.返回数据
        return Result.success();
    }


    /**
     * 单一查询
     *
     * @param id
     * @return
     */
    @Override
    public Result<Employee> getEmpById(Long id) {
        //1.非空判断
        if(id==null){
            return Result.error(MessageConstant.ID_NOT_FOUND);
        }
        //2.调mapper接口
        Employee employee = employeeMapper.getById(id);
        employee.setPassword("********");
        //3、返回数据
        return Result.success(employee);
    }

    /**
     * 修改员工
     *
     * @param dto
     * @return
     */
    @Override
    @Transactional
    public Result updateEmp(EmployeeDTO dto) {
        //1.非空判断
        if(dto.getId()==null){
            return Result.error(MessageConstant.ID_NOT_FOUND);
        }
        //2.调用mapper执行修改操作
        Employee employee=new Employee();
        BeanUtils.copyProperties(dto,employee);
        //修改时间//修改人
        employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.updateEmp(employee);

        //3.返回数据
        return Result.success();
    }



}
